* {
    margin: 0px;
    padding: 0px;
}
header{
	display: block;
	margin: 0 auto;
	width: 100%;
	text-align: center;
}
header #newganmebutton{
	margin: 20px auto;
	width: 100px;
	padding: 10px;
	background-color: #8f7a66;
	font-family: arial;
	color: white;
    cursor: pointer;
	border-radius: 10px;
}
header #newganmebutton:hover{
	background-color: #9f8b77;
}
#grid-container {
    margin: 10px auto;
    background-color: #bbada0;
    position: relative;
}

.grid-cell {
    background-color: #ccc0b3;
    border-radius: 6px;
    position: absolute;
}

.number-cell {
    font-family: arial;
    font-weight: bold;
    position: absolute;
    text-align: center;
}
.gameover{
	position: absolute;
	top: 0;
	right: 0;
	left: 0;
	bottom: 0;
	z-index: 9;
	background-color: rgba(200,200,200,.5);
	display: flex;
	justify-content: center;
	align-items: center;
}
.gameover-message{
	font-family: arial;
	font-weight: bold;
	font-size: 16px;
}